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abr-
Yea I guessed you meant 5mm!
You need something highly adhesive and totally waterproof, but the problem is that it may not be malleable enough for the way the original material folds and flexes with stuff inside.
If you’re desperate, message me your address and I’ll send you some scraps of ripstop (I have black/blue/whatever). So long as you can get them permanently adhered to the surface, I’d be surprised if you manage to get them to saturation point. I left some water drops on top of the material a few weeks ago, and they were sat there on top day after day.
pdlouche
Go to an outdoors shop and get seam sealant. You may be able to find it as an iron-on tape or adhesive. Its role is to seal up all the tiny stitching holes so it will do fine as a patching kit.